Split out RTN resolver errors into new error codes

[compiler-errors]

Also suppress a redundant/wrong error mentioning that RTN is not allowed in where clause position when bound fails to be resolved.

[rustbot]

r? @petrochenkov

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[rustbot]

HIR ty lowering was modified

cc @fmease

Some changes occurred in diagnostic error codes

cc @GuillaumeGomez

[rust-log-analyzer]

The job x86_64-gnu-llvm-18 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

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 > importing cache manifest from ghcr.io/rust-lang/rust-ci-cache:20950f2ccee3dff53a038adf5c1cf05231c0b30772617126a5f6478a66316a29cba9aead69f7bb0004886d32c1f8e6287542cf6d25130711c82d16a66201d4fe:
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##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-18]
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-18', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--set', 'change-id=99999999', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-18/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10
---

---- [ui] tests/ui/error-codes/E0802.rs stdout ----
diff of stderr:

- error[E0220]: associated function `method` not found for `T`
-   --> $DIR/E0802.rs:7:8
+ error[E0576]: cannot find method or associated constant `method` in trait `Trait`
+   --> $DIR/E0802.rs:7:19
3    |
- LL |     T::method(..): Send,
-    |        ^^^^^^ associated function `method` not found
+ LL |     <T as Trait>::method(..): Send,
6 
7 error: aborting due to 1 previous error
8 

---
To only update this specific test, also pass `--test-args error-codes/E0802.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/error-codes/E0802.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/error-codes/E0802" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/error-codes/E0802/auxiliary"
--- stderr -------------------------------
error[E0576]: cannot find method or associated constant `method` in trait `Trait`
##[error]  --> /checkout/tests/ui/error-codes/E0802.rs:7:19
   |
   |
LL |     <T as Trait>::method(..): Send,

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0576`.

[compiler-errors]

@rustbot author

[bors]

☔ The latest upstream changes (presumably #132361) made this pull request unmergeable. Please resolve the merge conflicts.

[petrochenkov]

@rustbot author

Not sure what is the status here.
@compiler-errors Do you plan to return to this?